Anyone try one of these??

[Blue32]

http://www.gtechpro.com/

how is it?

[01coolblue]

I used their older one. It was "ok." It gave you consistant, rounded figures so you could compare easily between mods. It is a fun tool to have when you are starting out doing mods. I would never use it as bragging rights for 1/4 mile results or anything.